Protocol describes the direct detection of RNA on DNA microarrays using Hybrid Capture (HC) technology and the HC ExpressArray Kit developed by Diagene. The kit uses a proprietary antibody that binds specifically to RNA:DNA hybrids and a second, fluorescently labeled, antibody that detects the primary antibody. Total RNA is applied directly to a glass-spotted DNA microarray, and stable RNA:DNA hybrids are visualized via a Cy3-labeled secondary antibody. - [Read Hybridization and Detection Using the HC ExpressArray Kit Protocol]